0.5.2

This is an urgent fix for playback stop button and audio engine switch that got broken due to the latest changes in audio graph changes, as well fixes for the crasher due to delayed plugin UI disposal after plugin instance disposal (i.e. use after free).

You can read the AI slop version: https://gist.github.com/atsushieno/2e3e9546273d41a2a7b68a5be4618e60